Sludge cleaning conditioner and method of making and using same

Abstract

The application belongs to the technical field of B01F dispersion and emulsification, and particularly relates to an oil sludge cleaning conditioner and a preparation method and use method thereof. The oil sludge cleaning conditioner is composed of medicament A and medicament B; the medicament A includes, in terms of weight fractions, 10-40 parts of a surfactant, 30-50 parts of isophorone, 10-30 parts of propylene glycol, and 10-20 parts of coconut oil diethanolamide; the medicament B includes, in terms of weight fractions, 40-65 parts of bentonite, 15-35 parts of an inorganic flocculant, 5-15 parts of a high molecular flocculant, 1-8 parts of a synergist, and 3-6 parts of a coupling agent. The use method of the oil sludge cleaning conditioner includes the following steps: S1, adding cleaning water to the oil sludge to obtain a mixed solution; S2, adjusting the pH range of the mixed solution to 7-12; S3, adding the medicament A, and the volume ratio of the medicament A to the oil sludge is 1:20-50; S4, stirring for 5-10 min; S5, adding the medicament B, and 20-40 g of the medicament B is added to each L of the oil sludge; and S6, continuing to stir for 5-10 min. The application can improve the separation efficiency of oil and sludge in the oil sludge particles, so that the oil content in the bottom sludge is less than 2%.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of B01F, B01D and C02F, and particularly relates to an oil sludge cleaning conditioner and a preparation method and use method thereof. BACKGROUND

[0002] Oil sludge is one of the main pollutants generated in the production process of oil fields, and its composition is complex and its difference is large. Oil sludge has been listed as HW08 hazardous waste in the National Hazardous Waste List. If not handled in time, it will cause different degrees of influence on the production area and the surrounding environment. In addition, oil sludge contains rich oil substances and has very important recycling value. The existing mainstream oil sludge treatment scheme in the market or engineering application pays great attention to the recycling of oil in oil sludge.

[0003] At present, the main treatment technical means of oil sludge mainly include pyrolysis method, incineration method, landfill method, solidification method and biodegradation method. Among them, the pyrolysis method has become the preferred scheme in the industry. For oil sludge with high oil content, an oil sludge cleaning step needs to be provided before the oil sludge enters the pyrolysis system. The additives such as polyacrylamide and polyaluminum chloride remaining in the oil sludge during the mining process can fix the oil molecules on the silt particles, forming a stable oil-in-mud solid-liquid particle structure, and the water is also present in the particle micropores of the oil-in-mud in the form of adsorbed water or capillary water. The thermochemical cleaning technology adds chemical reagents to change the force between the oil, water and mud in the oil sludge, which is beneficial to promote the separation of oil and mud. However, the oil sludge cleaning conditioner commonly seen in the market is not ideal for the separation of oil and mud, and it is difficult to achieve efficient separation of oil and mud.

[0004] Chinese patent document CN108529851A discloses an oil field sludge conditioner and a preparation method thereof. The composition of the oil field sludge conditioner is: dispersing agent 40-55 parts by weight, adsorbent 25-35 parts by weight, supporting agent 10-18 parts by weight, and synergist 5-11 parts by weight. The dispersing agent is selected from one or more of anhydrous calcium oxide, anhydrous calcium hydroxide, anhydrous magnesium oxide and anhydrous magnesium hydroxide. The Mg2+ or Ca2+ generated by the hydrolysis of the dispersing agent has the effect of electric neutralization and adsorption bridging, which can make the oil field sludge colloidal particles unstable and coagulate. The adsorbent is selected from one or both of fly ash and diatomite, and the adsorbent is a porous medium with large specific surface area, so it has strong water absorption. After mixing with the oil field sludge, the adsorbent particles will also be adsorbed on the surface of the oil field sludge particles, thereby reducing the probability of oil field sludge coagulation and aggregation and improving the dispersibility of the oil field sludge. The supporting agent is selected from cement. The synergist is composed of component 1 and component 2, component 1 is selected from one or both of anhydrous calcium chloride and anhydrous magnesium chloride, and component 2 is selected from anhydrous sodium silicate. This scheme can reduce the water content of the oil field sludge to below 40%.

[0005] Chinese patent document CN 112479513 A discloses a preparation method of oil-containing sludge composite curing material and its application. The oil-containing sludge composite curing material is composed of the following components in mass percentage: auxiliary material 50-80%, modifier 10-30%, flocculant 5-20%, and demulsifier 5-15%. The auxiliary material is fly ash, which has the property of lipophilicity and hydrophobicity. The modifier is made of gypsum, diatomite, bentonite, and hydrotalcite. When the four components are properly proportioned, the rate of modified dewatering of the oil-containing sludge can be accelerated, and the metal elements in the oil sludge can also be solidified. The flocculant is made of polyacrylamide, carboxymethyl cellulose, and rhamnolipid material. The main function of the flocculant is to realize the destabilization of the oil sludge, improve the dewatering effect of the oil sludge, and increase the dewatering rate. The demulsifier is selected from AE type polyoxyethylene polyoxypropylene polyether demulsifier and / or AR new oil-soluble non-ionic demulsifier, which destroys the emulsion by replacing the stable film of the oil sludge mixture. This scheme can realize oil sludge dewatering and oil sludge solidification in a short period at room temperature, and the solidified material can be used as a solid fuel to provide energy.

[0006] The above two schemes mainly focus on how to separate water from the oil sludge, but do not focus on the separation of oil and mud. The document CN 112479513 A even actually pursues the stable combination of oil and mud. SUMMARY

[0007] The present application aims to overcome the shortcomings of the prior art and provide an oil sludge cleaning conditioner to improve the separation efficiency of oil and mud in the oil sludge particles, so that the oil content in the bottom mud is less than 2%.

[0008] The oil sludge cleaning conditioner is composed of agent A and agent B.

[0009] Agent A, by weight fraction, includes:

[0010] 10-40 parts of surfactant;

[0011] 30-50 parts of isophorone;

[0012] 10-30 parts of propylene glycol;

[0013] 10-20 parts of cocodiethanolamide;

[0014] Agent B, by weight fraction, includes:

[0015] 40-65 parts of bentonite;

[0016] 15-35 parts of inorganic flocculant, selected from one or more of polyaluminum chloride, polyaluminum sulfate, and polyaluminum ferric sulfate;

[0017] 5-15 parts of high molecular flocculant, selected from one or both of sodium polyacrylate and polyacrylamide;

[0018] Synergist 1-8 parts, selected from one or more of fly ash, diatomite, attapulgite;

[0019] Coupling agent 3-6 parts, selected from one or both of dodecyl ethoxy sulfobetaine, dodecyl hydroxypropyl sulfobetaine.

[0020] As an improvement, the surfactant is selected from one or more of gemini cationic surfactant, gemini nonionic surfactant, branched cationic surfactant, branched nonionic surfactant.

[0021] As an improvement, the bentonite in the medicament B is sodium-based bentonite.

[0022] As an improvement, the medicament B further comprises:

[0023] Abrasive 3-10 parts, selected from quartz sand, corundum, alumina abrasive, mesh size 16-100 mesh.

[0024] In one embodiment, the oil sludge cleaning conditioner is composed of medicament A and medicament B;

[0025] Medicament A, by weight fraction, comprises:

[0026] Surfactant 30 parts, the surfactant is a gemini cationic surfactant;

[0027] Isophorone 30 parts;

[0028] Propylene glycol 20 parts;

[0029] Cocodiethanolamide 20 parts;

[0030] Medicament B, by weight fraction, comprises:

[0031] Bentonite 50 parts;

[0032] Polyaluminum sulfate 25 parts;

[0033] Polyacrylamide 10 parts;

[0034] Diatomite 5 parts;

[0035] Dodecyl ethoxy sulfobetaine 4 parts;

[0036] Quartz sand abrasive 5 parts.

[0037] In another embodiment, the oil sludge cleaning conditioner is composed of medicament A and medicament B;

[0038] Medicament A, by weight fraction, comprises:

[0039] Surfactant 40 parts, the surfactant is a gemini nonionic surfactant;

[0040] isophorone 35 parts;

[0041] propylene glycol 15 parts;

[0042] coconut oil diethanolamide 15 parts;

[0043] The medicament B comprises, by weight fraction:

[0044] bentonite 40 parts;

[0045] polyaluminum chloride 28 parts;

[0046] polyacrylamide 8.5 parts;

[0047] fly ash 1 part;

[0048] diatomite 2 parts;

[0049] dodecyl hydroxypropyl sulfobetaine 4 parts;

[0050] quartz sand abrasive 4 parts.

[0051] In another embodiment, the oil sludge cleaning conditioner is composed of medicament A and medicament B;

[0052] The medicament A comprises, by weight fraction:

[0053] surfactant 35 parts, the surfactant is branched cationic surfactant;

[0054] isophorone 35 parts;

[0055] propylene glycol 20 parts;

[0056] coconut oil diethanolamide 20 parts;

[0057] The medicament B comprises, by weight fraction:

[0058] bentonite 40 parts;

[0059] polyaluminum chloride 25 parts;

[0060] sodium polyacrylate 10 parts;

[0061] fly ash 1 part;

[0062] diatomite 5 parts;

[0063] dodecyl hydroxypropyl sulfobetaine 3 parts;

[0064] quartz sand abrasive 6 parts.

[0065] The application also provides a preparation method of the oil sludge cleaning conditioner, comprising preparation of medicament A and preparation of medicament B;

[0066] The preparation method of the medicament A is to mix the components and stir them uniformly;

[0067] The preparation method of the medicament B is:

[0068] S1, adding inorganic flocculants and coupling agents in bentonite, stirring at 70-90°C, standing for 5-20h after stirring, drying and grinding, to obtain an intermediate product;

[0069] S2, mixing the remaining components with the intermediate product and stirring them uniformly.

[0070] The application also provides a use method of the oil sludge cleaning conditioner, comprising the following steps:

[0071] S1, adding cleaning water in the oil sludge to obtain a mixture, stirring and heating to 60-100°C;

[0072] S2, adjusting the pH range of the mixture to 7-12;

[0073] S3, adding the medicament A, and the volume ratio of the medicament A to the oil sludge is 1:20-50;

[0074] S4, stirring for 5-10min;

[0075] S5, adding the medicament B, and the amount of the medicament B added per L of the oil sludge is 20-40g;

[0076] S6, continuing to stir for 5-10min.

[0077] As an improvement, in step S1, the volume ratio of the cleaning water added in the oil sludge to the oil sludge is 5-10:1.

[0078] As an alternative, the use method of the oil sludge cleaning conditioner can adopt the following steps:

[0079] S1, adding cleaning water in the oil sludge to obtain a mixture, stirring and heating to 60-100°C;

[0080] S2, adjusting the pH range of the mixture to 7-12;

[0081] S3, simultaneously adding the medicament A and the medicament B, and the volume ratio of the medicament A to the oil sludge is 1:20-50, and the amount of the medicament B added per L of the oil sludge is 20-40g;

[0082] S4, stirring for 10-20min.

[0083] The beneficial effects of the application are:

[0084] 1. The medicaments described in the application can well separate oil and sludge, and the upper oil layer contains less impurities such as water and sand after centrifugation;

[0085] 2、Using the agent described in the application can make the oil content of the treated bottom mud reduced to 2% or less.

[0086] 3、The bentonite in the application is a negative material, which can neutralize and adsorb polyacrylamide in the oil sludge particles and harmful heavy metal ions in the crude oil in the flocculation process, which is beneficial to the passivation treatment of heavy metal ions and the separation of polyacrylamide and crude oil, and improves the quality of the upper oil sludge.

[0087] 4、The agent in the application can treat a wide range of oil-containing sludge types, and the oil content of the oil sludge is 10%-70%, the pH range is 7-12, and the oil sludge can allow a small amount of oil polyacrylamide and other oil displacement agents, organic phosphonic acid scale inhibitors and other commonly used chemical reagents related to oil field exploitation. BRIEF DESCRIPTION OF DRAWINGS

[0088] Figure 1 is the state diagram of the bottom mud after drying in four groups of samples in embodiment 1 of the application.

[0089] Figure 2 is the state diagram of the bottom mud after drying in two groups of samples in embodiment 2 of the application.

[0090] Figure 3 is the state diagram of the bottom mud after drying in three groups of samples in embodiment 3 of the application. DETAILED DESCRIPTION

[0091] Embodiment 1

[0092] 1、Preparation of oil sludge cleaning conditioner

[0093] (1) Preparation of sludge treatment agent A

[0094] Agent A is a liquid agent, which comprises: 30 parts of gemini cationic surfactant, 30 parts of isophorone, 20 parts of propylene glycol, and 20 parts of coconut oil diethanolamide, stirring for 1h, and uniformly mixing.

[0095] (2) Preparation of oil-containing sludge treatment agent B

[0096] The medicament B is a solid medicament, and the specific method is as follows: 5.0 g of sodium bentonite is weighed into a beaker, then 0.4 g of dodecyl ethoxy sulfobetaine, 2.5 g of polyaluminum sulfate are added, heated to 80°C by a water bath heating pot, heated and stirred by a mechanical stirrer for 1 h, placed for 8 h after stirring, dried in an oven at 50°C for 24 h. Then remove the ground 100 mesh sieve to obtain an intermediate product. The intermediate product is taken out and put into a beaker, 1 g of polyacrylamide and 0.5 g of diatomite are added, stirred and mixed by a mechanical stirrer for 1 h, uniformly stirred and passed through a 100 mesh sieve. 0.5 g of quartz sand abrasive is added and uniformly stirred to obtain a treatment medicament.

[0097] 2. Use of the oil sludge cleaning conditioner

[0098] The experimental oil sludge is taken from a certain oil field in Shaanxi, China, containing 46% of oil, 22% of water, and 14 Cp of viscosity, mainly being light or medium crude oil.

[0099] 20 ml of the oil-containing sludge sample is taken, 100 mL of water is added, and placed in a high-speed shearing stirrer, heated to 60°C, first high-speed shearing, the speed is 6000 r / min, the time is 5 min. After adjusting the pH of the mixed solution to 10, 1 ml of medicament A is added, high-speed shearing is performed again, the speed is 6000 r / min, the time is 5 min, then 0.4 g of medicament B is added, high-speed shearing is performed again, the speed is 6000 r / min, the time is 5 min, finally, three-phase separation is obtained by sedimentation to obtain three layers of material, the upper layer is high-quality crude oil, the middle layer is water layer, and the bottom layer is mud and sand. This group is marked as experimental group 1#.

[0100] 3. Effect comparison experiment of the oil sludge cleaning conditioner

[0101] The control experiment scheme 1 is as follows: 20 ml of the same oil-containing sludge sample is taken, 100 mL of water is added, and placed in a high-speed shearing stirrer, heated to 60°C, first high-speed shearing, the speed is 6000 r / min, the time is 5 min, the pH of the mixed solution is adjusted to 10, 5 ml of medicament A is added, high-speed shearing is performed again, the speed is 6000 r / min, the time is 10 min, finally, three-phase separation is obtained by sedimentation to obtain three layers of material, the upper layer is crude oil layer, the middle layer is water layer, and the bottom layer is mud and sand. This group is marked as experimental group 2#.

[0102] The control experiment scheme 2 is: taking 20 ml of the same oily sludge sample, adding 100 mL of water, putting into a high-speed shearing stirrer, heating to 60°C, first performing high-speed shearing, the rotating speed is 6000 r / min, the time is 5 min, adjusting the pH of the mixed solution to 10, adding 0.5 g of the medicament B, performing high-speed shearing again, the rotating speed is 6000 r / min, the time is 10 min, finally performing three-phase separation by sedimentation to obtain three layers of substances, the upper layer is a crude oil layer, the middle layer is a water layer, and the bottom layer is a sludge. This group is marked as experiment group 3#.

[0103] The control experiment group 3 is: taking 20 ml of the oily sludge sample, adding 100 mL of water, putting into a high-speed shearing stirrer, heating to 60°C, first performing high-speed shearing, the rotating speed is 6000 r / min, the time is 5 min, adjusting the pH of the mixed solution to 10, adding 1 ml of the medicament A, performing high-speed shearing again, the rotating speed is 6000 r / min, the time is 5 min, then adding 0.4 g of pure bentonite, performing high-speed shearing again, the rotating speed is 6000 r / min, the time is 5 min, finally performing three-phase separation by sedimentation to obtain three layers of substances, the upper layer is a high-quality crude oil, the middle layer is a water layer, and the bottom layer is a sludge. This group is marked as experiment group 4#.

[0104] 4、Experimental results of experiment group 1#, experiment group 2#, experiment group 3# and experiment group 4#

[0105] Through observation and measurement, it is known that the mass of the oil layer in experiment group 1#, experiment group 2#, experiment group 3# and experiment group 4# is 7.9 g, 6.1 g, 8.8 g and 8.3 g respectively. The oil content of the upper crude oil layer is tested by using an infrared oil measuring instrument, and the oil content of experiment group 1#, experiment group 2#, experiment group 3# and experiment group 4# is 95.4%, 97.5%, 71.6% and 81.8% respectively.

[0106] The bottom sludge of the four groups of samples is placed at 105°C for 24 h for drying, and the state is as shown in Figure 1 The oil content of the bottom sludge is tested according to the mineral oil detection method in the Sludge Test Method for City Sewage Treatment Plant (CJT221-2005), and finally the oil content of the bottom sludge of experiment group 1#, experiment group 2#, experiment group 3# and experiment group 4# is 10 mg / g, 98 mg / g, 188 mg / g and 146 mg / g respectively.

[0107] From the experimental results, it can be seen that: (1) the combined agent separates the largest amount of net crude oil and has higher purity, while the crude oil layer obtained by using pure reagent A has the highest purity, but the separation effect is poor, and there is a lot of residue. The quality of the crude oil layer obtained by using pure reagent B is the largest, but the purity is very low, and there are still light particles of oil-encapsulated mud in it. When reagent B is replaced by pure bentonite, the quality of the crude oil layer obtained is slightly increased compared to experimental group 1#, but the purity is slightly decreased, which means that there are still light particles of oil-mud in the upper crude oil. (2) Only experimental group 1# using the combined agent meets the limit value of the "Disposal and Utilization Control Limit of Oil-containing Sludge" (DB61 / T 1025-2016) of Shaanxi Province, which stipulates that the sludge produced after treatment of oil-containing sludge is suitable for laying oilfield well sites, grade highways or used as raw materials for industrial production.

[0108] Example 2

[0109] 1. Preparation of oil sludge cleaning conditioner

[0110] (1) Preparation of sludge treatment agent A

[0111] Agent A is a liquid agent, which includes: 40 parts of Gemini non-ionic surfactant, 35 parts of isophorone, 15 parts of propylene glycol, 15 parts of coconut oil diethanolamide, stirring for 1 h, and uniform mixing.

[0112] (2) Preparation of oil-containing sludge treatment agent B

[0113] Agent B is a solid agent, and the specific method is: 4.0 g of sodium-based bentonite is weighed and placed in a beaker, then 0.4 g of dodecyl hydroxypropyl sulfobetaine, 2.8 g of polyaluminum chloride are added, heated to 80°C by water bath heating pot, and heated and stirred by mechanical stirrer for 1 h. After stirring, it is placed for 12 h, dried in an oven at 50°C for 24 h. Then remove and grind through a 100 mesh sieve to obtain an intermediate product. Take the intermediate product and place it in a beaker, while adding 0.85 g of sodium polyacrylate, 0.2 g of diatomite and 0.1 g of fly ash, and stir and mix for 1 h by mechanical stirrer. After uniform stirring, pass through a 100 mesh sieve. Then add 0.4 g of quartz sand abrasive and stir uniformly to obtain the treatment agent.

[0114] 2. Use of oil sludge cleaning conditioner

[0115] The experimental oil sludge is taken from the oil-containing sludge of an oil field in Xinjiang, China, which contains 36% oil, 39% water, and has a viscosity of 44 cP, mainly medium paraffin-based crude oil.

[0116] Take 20 ml of oily sludge sample, add 150 mL of water, put into high-speed shearing stirrer, heated to 60°C, first high-speed shearing, speed 10000 r / min, time 6 min, adjust the pH of the mixture to 12, add the agent A of the application 1 ml, high-speed shearing again, speed 10000 r / min, time 7 min, then add the agent B of the application 0.5 g, high-speed shearing again, speed 10000 r / min, time 5 min, finally, through the settlement, three-phase separation to obtain three layers of material, the upper layer is high-quality crude oil, the middle layer is water layer, and the bottom layer is sand. This group is marked as experimental group 5#.

[0117] 3. Preparation of the control oily sludge cleaning conditioner

[0118] The preparation method of the control oily sludge cleaning conditioner is that, in the preparation of the oily sludge treatment agent B, 4.0 g of diatomite is used instead of 4.0 g of sodium-based bentonite, and the rest is the same. The prepared treatment agent B is marked as B#.

[0119] 4. Effect comparison experiment of the oily sludge cleaning conditioner

[0120] The experimental scheme of the control experimental group 1 is as follows: take 20 ml of oily sludge sample, add 150 mL of water, put into high-speed shearing stirrer, heated to 60°C, first high-speed shearing, speed 10000 r / min, time 5 min, adjust the pH of the mixture to 12, add the agent A of the application 1 ml, high-speed shearing again, speed 10000 r / min, time 5 min, then add the control agent B# 0.5 g, high-speed shearing again, speed 10000 r / min, time 5 min, finally, through the settlement, three-phase separation to obtain three layers of material, the upper layer is high-quality crude oil, the middle layer is water layer, and the bottom layer is sand. This group is marked as experimental group 6#.

[0121] 4. Experimental results of experimental group 5# and experimental group 6#

[0122] It is known through observation and measurement that the mass of the oil layer of experimental group 5# and experimental group 6# is 6.4 g and 7.0 g respectively. The oil content of the upper crude oil layer is tested by using an infrared oil measuring instrument, and the oil content of experimental group 5# and experimental group 6# is 96.4% and 77.1% respectively.

[0123] The bottom mud of the two groups of samples is placed at 105°C for 24 h for drying, and the state is as shown in Figure 2 The oil content of the bottom mud is tested according to the detection method of mineral oil in the city sewage treatment plant sludge inspection method (CJT221-2005), and finally the oil content of the bottom mud of experimental group 5# and experimental group 6# is measured to be 18 mg / g and 154 mg / g respectively,

[0124] From the experimental results, it can be seen that: (1) In the experimental group 5#, the combined reagent using sodium bentonite as the base material of reagent B separates the largest amount of pure crude oil and has higher purity. Although the quality of the crude oil layer obtained in the experimental group 6# in which the sodium bentonite in the original reagent B is replaced by diatomite increases, the purity decreases significantly, which means that there are oil sludge light particles in the upper layer of crude oil. (2) Only the experimental group 5# using the combined reagent meets the limit value provision of the Xinjiang Uygur Autonomous Region “Oil and Gas Field Oily Sludge and Drilling Solid Waste Treatment and Disposal Technical Specification” (DB65 / T 3999-2017) for the pollution control of solid waste produced after the treatment of oily sludge.

[0125] Example 3

[0126] 1. Preparation of oil sludge cleaning conditioner

[0127] (1) Preparation of oily sludge treatment reagent A

[0128] 35 parts of branched cationic surfactant, 35 parts of isophorone, 20 parts of propylene glycol, and 20 parts of coconut oil diethanolamide were stirred for 1 h and uniformly mixed.

[0129] (2) Preparation of oily sludge treatment reagent B

[0130] 4.0 g of sodium bentonite was weighed into a beaker, then 0.3 g of dodecyl hydroxypropyl sulfobetaine, 2.5 g of polyaluminum chloride were added, heated to 80°C by water bath heating pot, heated and stirred by mechanical stirrer for 1 h, placed for 12 h after stirring, dried in an oven at 50°C for 24 h. Then remove and grind through a 100 mesh sieve to obtain an intermediate product. Take the intermediate product into a beaker, add 1 g of sodium polyacrylate, 0.5 g of diatomite and 0.1 g of fly ash at the same time, stir and mix for 1 h by mechanical stirrer, stir uniformly, pass through a 100 mesh sieve. Then add 0.6 g of quartz sand abrasive, stir uniformly, and obtain the treatment reagent.

[0131] 2. Use of oil sludge cleaning conditioner

[0132] The experimental oil sludge was taken from the oily sludge of an oil field in Xinjiang, China, which contained 31% oil, 26% water, and had a viscosity of 35 cP, mainly being medium paraffin-based crude oil.

[0133] Take 20 ml of oily sludge sample, add 100 ml of water, put into high-speed shearing mixer, heat to 60℃, first high-speed shearing, speed is 10000r / min, time is 8 min, adjust the pH of the mixture to 8, add the agent A of the application 1 ml, high-speed shearing again, speed is 10000r / min, time is 6 min, then add the agent B of the application 0.5g, high-speed shearing again, speed is 10000r / min, time is 6 min, finally, through the way of settlement, three-phase separation is carried out to obtain three layers of material, the upper layer is high-quality crude oil, the middle layer is water layer, and the bottom layer is mud and sand. This group is marked as experimental group 7#.

[0134] 3、Oil sludge cleaning conditioner effect control experiment

[0135] Control experiment scheme 1 is: take 20 ml of the same oily sludge sample, add 100 ml of water, put into high-speed shearing mixer, heat to 60℃, first high-speed shearing, speed is 10000r / min, time is 8 min, adjust the pH of the mixture to 8, add agent A 1 ml and agent B 0.5g at the same time, time is 12 min, finally, through the way of settlement, three-phase separation is carried out to obtain three layers of material, the upper layer is crude oil layer, the middle layer is water layer, and the bottom layer is mud and sand. This group is marked as experimental group 8#.

[0136] Control experiment scheme 2 is: take 20 ml of the same oily sludge sample, add 100 ml of water, put into high-speed shearing mixer, heat to 60℃, first high-speed shearing, speed is 10000r / min, time is 8 min, adjust the pH of the mixture to 8, add 1.5g of oily sludge separation agent developed by a domestic company, model LDH-615, its main components are polyacrylamide, polyaluminum chloride and activated carbon, high-speed shearing again, speed is 10000r / min, time is 10 min, finally, through the way of settlement, three-phase separation is carried out to obtain three layers of material, the upper layer is crude oil layer, the middle layer is water layer, and the bottom layer is mud and sand. This group is marked as experimental group 9#.

[0137] 4、Experimental group 7#, experimental group 8# and experimental group 9# experimental result explanation

[0138] Through observation and measurement, the mass of the oil layer of experimental group 7#, experimental group 8# and experimental group 9# is 5.0g, 5.3g and 5.9g respectively. The oil content of the upper crude oil layer is tested by infrared oil measuring instrument, and the oil content of experimental group 7#, experimental group 8# and experimental group 9# is 92.1%, 87.8% and 82.5% respectively.

[0139] Take the bottom mud of the three groups of samples, dry at 105℃ for 24h, the state is as follows Figure 3The oil content of the sediment was tested according to the method for testing mineral oil in the municipal sewage treatment plant sludge test method (CJT221-2005). The oil content of the sediment in experimental group 7#, experimental group 8# and experimental group 9# was 19 mg / g, 36 mg / g and 57 mg / g, respectively.

[0140] The experimental results show that: (1) Compared with the experimental results of simultaneously adding A and B agents and using commercial oil sludge separation agents, the amount of pure crude oil separated by the combined agent is the most and the purity is higher, so the effect of the crude oil layer obtained by using the combined agent A+B is the best. (2) The simultaneous addition of A and B agents can achieve certain separation effect, which is superior to other commercial oil sludge separation agents, but still cannot achieve the effect of step-by-step addition of A and B agents. This may be due to the process of stripping the oil molecules in the oil sludge particles into water by agent A, which requires a certain action time. When agents A and B are added at the same time, the bentonite and polyaluminum chloride in agent B will quickly reduce the double electric layer of the oil sludge particles and neutralize part of the charge, thus playing a flocculation role, so that the oil molecules in the oil sludge cannot be separated in time and are deposited with the silt flocculation. According to the limit value provision for the pollution control of solid waste produced after the treatment of oil-containing sludge in the Oil and Gas Field Oil-Containing Sludge and Drilling Solid Waste Treatment and Disposal Technical Specification (DB65 / T 3999-2017) of Xinjiang Uygur Autonomous Region, experimental group #6 can meet the requirements of this specification.

Claims

1. A sludge cleaning conditioner, characterized by, consisting of a medicament A and a medicament B; The medicament A comprises, by weight fraction: a surfactant 10-40 parts; isophorone 30-50 parts; propylene glycol 10-30 parts; coconut oil diethanolamide 10-20 parts; The medicament B comprises, by weight fraction: bentonite 40-65 parts; an inorganic flocculant 15-35 parts, selected from one or more of polyaluminum chloride, polyaluminum sulfate, polyaluminum ferric sulfate; a high molecular flocculant 5-15 parts, selected from one or more of polyacrylic acid sodium and polyacrylamide; a synergist 1-8 parts, selected from one or more of fly ash, diatomite, and attapulgite; a coupling agent 3-6 parts, selected from one or more of dodecyl ethoxy sulfobetaine and dodecyl hydroxypropyl sulfobetaine.

2. The sludge washing conditioner according to claim 1, characterized in that: The surfactant is selected from one or more of gemini cationic surfactant, gemini nonionic surfactant, branched cationic surfactant, and branched nonionic surfactant.

3. The sludge washing conditioner according to claim 1, characterized in that: The bentonite in the medicament B is sodium-based bentonite.

4. The sludge washing conditioner according to claim 1, characterized in that: The medicament B further comprises: an abrasive 3-10 parts, selected from quartz sand, corundum, and alumina abrasive, with a mesh size of 16-100 mesh.

5. The sludge cleaning conditioner according to claim 1, characterized by consisting of a medicament A and a medicament B; The medicament A comprises, by weight fraction: a surfactant 30 parts, which is a gemini cationic surfactant; isophorone 30 parts; propylene glycol 20 parts; coconut oil diethanolamide 20 parts; The medicament B comprises, by weight fraction: bentonite 50 parts; polyaluminum sulfate 25 parts; polyacrylamide 10 parts; diatomite 5 parts; dodecyl ethoxy sulfobetaine 4 parts; quartz sand abrasive 5 parts.

6. The sludge washing conditioner according to claim 1, characterized by consisting of a medicament A and a medicament B; The medicament A comprises, by weight fraction: a surfactant 40 parts, which is a gemini nonionic surfactant; isophorone 35 parts; propylene glycol 15 parts; coconut oil diethanolamide 15 parts; The medicament B comprises, by weight fraction: bentonite 40 parts; polyaluminum chloride 28 parts; polyacrylamide 8.5 parts; fly ash 1 part; diatomite 2 parts; dodecyl hydroxypropyl sulfobetaine 4 parts; quartz sand abrasive 4 parts.

7. The sludge washing conditioner according to claim 1, characterized by consisting of a medicament A and a medicament B; The medicament A comprises, by weight fraction: a surfactant 35 parts, which is a branched cationic surfactant; isophorone 35 parts; propylene glycol 20 parts; coconut oil diethanolamide 20 parts; The medicament B comprises, by weight fraction: bentonite 40 parts; polyaluminum chloride 25 parts; polyacrylic acid sodium 10 parts; fly ash 1 part; diatomite 5 parts; dodecyl hydroxypropyl sulfobetaine 3 parts; quartz sand abrasive 6 parts.

8. The method for preparing the sludge cleaning conditioner according to any one of claims 1 to 7, wherein comprising preparation of a medicament A and preparation of a medicament B; The preparation method of the medicament A is to mix and stir the components uniformly; The preparation method of the medicament B is: S1. Add an inorganic flocculant and a coupling agent to bentonite, stir at 70-90°C, and after stirring is completed, stand for 5-20h, dry, and grind and sieve to obtain an intermediate product; S2. Mix the remaining components with the intermediate product and stir uniformly.

9. The method of using the sludge cleaning conditioner according to any one of claims 1 to 7, wherein, comprising the following steps: S1. Add cleaning water to the oil sludge to obtain a mixed solution, stir, and heat to 60-100°C; S2. Adjust the pH of the mixed solution to the range of 7-12; S3, adding agent A, the volume ratio of agent A to oil sludge is 1:20-50; S4, stirring for 5-10 min; S5, adding agent B, 20-40 g of agent B per L of oil sludge; S6, continuing to stir for 5-10 min.

10. The method of using the sludge cleaning conditioner according to any one of claims 9, wherein, In step S1, the volume ratio of washing water to oil sludge added in the oil sludge is 5-10:

1.

11. The method of using the sludge cleaning conditioner according to any one of claims 1 to 7, wherein, Comprising the following steps: S1, adding washing water to the oil sludge to obtain a mixed solution, stirring and heating to 60-100℃; S2, adjusting the pH of the mixed solution to the range of 7-12; S3, adding agent A and agent B at the same time, the volume ratio of agent A to oil sludge is 1:20-50, and 20-40 g of agent B per L of oil sludge; S4, stirring for 10-20 min.

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